Update .gitlab-ci.yml

1 job from master in 16 minutes 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Buildiso
failed #13
run-build

16:45

 
Name Stage Failure
failed
run-build Buildiso There is an unknown failure, please try again
W: See /builds/libregeekingkid/hamara-live-build/build_area/hamara-sugam-amd64/chroot/debootstrap/debootstrap.log for details
P: Begin unmounting filesystems...
P: Saving caches...
/usr/bin/env: 'apt-get': No such file or directory
[Failed] Try again.
$ mkdir build
$ mv output build/
mv: cannot stat 'output': No such file or directory
ERROR: Job failed: exit code 1